Drawing and punching dies

Abstract

The present invention relates to the field of mold technology, and specifically provides a drawing and punching mold, which aims to solve the problem that it is difficult for existing molds to simultaneously draw and punch sheet materials, thereby causing deviations in the production accuracy of parts. To this end, the drawing and punching mold of the present invention includes a first die base and a second die base that are arranged correspondingly, a pressure ring is arranged in the second die base, a punch assembly is arranged in the pressure ring, and a die assembly is connected to the first die base; an accommodating cavity is arranged on the die assembly, a pressing assembly is movably arranged in the accommodating cavity, the pressing assembly includes a pressing block and a pressing profile arranged on the pressing block, and a local profile is arranged on the punch assembly; the punching assembly includes a connected punch base and a punch, a through hole is arranged on the pressing block, the punch is movably arranged in the through hole, and a punching sleeve is arranged on the punch assembly. The pressing profile and the local profile can draw a local area of ​​the sheet material, and the accuracy of the punching is guaranteed by the arrangement of the punch and the through hole.

Description

Technical Field

[0001] The invention relates to the technical field of dies, and in particular provides a drawing and punching die. Background Art

[0002] Drawing dies and punching dies are important tools for the stamping production of automotive parts. Drawing dies are responsible for forming the surface of stamped parts, and punching dies are responsible for punching and cutting out the hole features of parts. In the traditional stamping process, drawing dies and punching dies are two independent sets of dies. The surface is first formed by the drawing die, and then the punching die is used to punch the already formed surface. The disadvantage of traditional independent dies is that after the stamping part is drawn, it is transferred from the drawing die to the punching die, and then punched after secondary positioning. Due to unstable positioning, the parts move. Under this condition, the position of the punching completed relative to the surface cannot be accurately guaranteed, especially for flat parts with large springback. The poor positioning accuracy leads to hole position deviation, and the deviation values ​​of parts from different batches are inconsistent. Repeated rectification of the mold cannot meet the matching requirements, affecting the manufacturing accuracy of the whole vehicle, resulting in a large waste of manpower and material resources. In summary, it is difficult for existing molds to simultaneously draw and punch local areas of the sheet metal, resulting in deviations in the parts that are difficult to meet production standards.

[0003] Accordingly, the art needs a new drawing and punching die to solve the above problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing mold is difficult to draw and punch the sheet metal at the same time, which leads to deviation of the parts and makes it difficult to meet the production standards.

[0005] The present invention provides a drawing and punching die, which comprises a first die base, a second die base, a die assembly, a punch assembly, a pressure ring, a pressure assembly and a punching assembly, wherein the first die base and the second die base are arranged correspondingly, the pressure ring is arranged in the second die base, the punch assembly is arranged in the pressure ring, and the die assembly is connected to the first die base; the die assembly is provided with an accommodating cavity penetrating the die assembly, the pressure assembly is movably arranged in the accommodating cavity, the pressure assembly comprises a pressure block and a pressure profile arranged on the pressure block, and the punch assembly is provided with a local profile matching the pressure profile; the punching assembly comprises a connected punch base and a punch, the pressure block is provided with a through hole penetrating the pressure block, the punch is movably arranged in the through hole, and the punch assembly is provided with a punching sleeve matching the punch.

[0006] In the preferred technical solution of the above-mentioned drawing and punching die, the accommodating cavity includes a first cavity, a second cavity and a third cavity which are connected to each other, the second cavity and the third cavity are respectively located on both sides of the first cavity, the cross-sectional area of ​​the first cavity is larger than the cross-sectional area of ​​the second cavity, the cross-sectional area of ​​the third cavity is larger than the cross-sectional area of ​​the first cavity, the pressing block includes a first pressing block and a second pressing block, the pressing profile is arranged on the second pressing block, the first pressing block is arranged to be able to move in the first cavity, the second pressing block is arranged to be able to move in the second cavity, and the third cavity is arranged to accommodate the punch base.

[0007] In the preferred technical solution of the above-mentioned drawing and punching die, a plurality of first guide members are arranged on the first cavity, and a plurality of matching second guide members are arranged on the first pressing block.

[0008] In the preferred technical solution of the above-mentioned drawing and punching die, a plurality of first sliding members are arranged on the inner wall of the first cavity, a matching second sliding member is arranged on the first pressing block, and the first cavity and the first pressing block move relative to each other through the first sliding members and the second sliding members.

[0009] In the preferred technical solution of the above-mentioned drawing and punching die, a plurality of first hardening blocks are arranged in the first cavity, and a plurality of matching second hardening blocks are arranged on the first pressing block.

[0010] In the preferred technical solution of the above-mentioned drawing and punching die, a nitrogen spring is provided on the side of the pressing block close to the first die base, and a matching nitrogen spring hardening block is provided on the punch base, and when the first die base and the second die base are closed in place, the nitrogen spring is compressed and the nitrogen spring and the nitrogen spring hardening block are abutted and connected.

[0011] In the preferred technical solution of the above-mentioned drawing and punching die, a limiting member is provided on one side of the punch base close to the pressing block, and the limiting member is configured to abut against the pressing block when the first die base and the second die base are closed in place.

[0012] In the preferred technical solution of the above-mentioned drawing and punching die, the drawing and punching die further comprises a waste recovery component, and the waste recovery component is configured to be able to recover the sheet material waste generated at the punching sleeve.

[0013] In the preferred technical solution of the above-mentioned drawing and punching die, the waste recovery component is a waste slide plate, a first avoidance hole is provided on the punch assembly, a second avoidance hole is provided on the side wall of the pressure ring, and a third avoidance hole is provided on the second die base, and the waste slide plate passes through the first avoidance hole, the second avoidance hole and the third avoidance hole in sequence from the inside of the punch assembly and extends to the outside of the second die base.

[0014] In the preferred technical solution of the above-mentioned drawing and punching die, a plurality of first connecting holes are provided on the die assembly, a plurality of matching second connecting holes are provided on the punch base, and fasteners pass through the first connecting holes and the second connecting holes and are fixed to connect the punching assembly and the die assembly.

[0015] In the case of adopting the above-mentioned technical scheme, the drawing and punching die of the present invention includes a first die base, a second die base, a die assembly, a punch assembly, a pressure ring, a pressure assembly and a punching assembly, the first die base and the second die base are arranged correspondingly, the pressure ring is arranged in the second die base, the punch assembly is arranged in the pressure ring, and the die assembly is connected to the first die base; the die assembly is provided with a accommodating cavity passing through the die assembly, the pressure assembly is movably arranged in the accommodating cavity, the pressure assembly includes a pressure block and a pressure profile arranged on the pressure block, and the punch assembly is provided with a local profile matching the pressure profile; the punching assembly includes a connected punch base and a punch, the pressure block is provided with a through hole passing through the pressure block, the punch is movably arranged in the through hole, and the punch assembly is provided with a punching sleeve matching the punch. The present invention can draw a local area of ​​a sheet material by setting the pressing profile and the local profile, and can punch the sheet material after drawing by movably setting the punch in the through hole, while ensuring the accuracy of the punching.

[0016] Furthermore, the present invention can prevent the pressing assembly from falling off in the accommodating cavity through the matching arrangement of the first pressing block and the first cavity and the matching arrangement of the second pressing block and the second cavity.

[0017] Furthermore, the present invention can provide a guiding function during the movement of the pressing assembly through the provision of the first guide member and the second guide member, so as to facilitate the pressing assembly to return to its original position when not working.

[0018] Furthermore, the present invention also facilitates the movement of the pressing assembly in the accommodating chamber by disposing the first sliding member and the second sliding member.

[0019] Furthermore, the present invention can prevent the material pressing assembly and the accommodating chamber from colliding and causing damage when the material pressing assembly is descending by providing the first hardening block and the second hardening block.

[0020] Furthermore, the present invention can automatically reset the pressing assembly through the provision of the nitrogen spring.

[0021] Furthermore, the present invention can limit the movement range of the pressing assembly and the punching assembly by setting the limiting component.

[0022] Furthermore, the present invention can also recycle waste materials after punching of sheet materials through the provision of the waste recycling component. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0024] Figure 1 It is a structural exploded diagram of the drawing and punching die of the present invention;

[0025] Figure 2 is a cross-sectional view of the receiving cavity of the female mold assembly of the present invention;

[0026] Figure 3 is a structural diagram of the male mold assembly of the present invention;

[0027] Figure 4 yes Figure 3 A partial enlarged view of the structure;

[0028] Figure 5 yes Figure 3 A cross-sectional view of some structures in ;

[0029] Figure 6 yes Figure 5 A partial enlarged view of the structure;

[0030] Figure 7 It is a cross-sectional view of a part of the structure after the concave die assembly, the pressing assembly and the punching assembly of the present invention are connected;

[0031] Figure 8 It is a cross-sectional view of a part of the structure after the first die base, the concave die assembly, the pressing assembly and the punching assembly of the present invention are connected;

[0032] Fig. 9 is a structural diagram of the punching assembly of the present invention;

[0033] Fig.10 yes Fig. 9 An exploded view of the structure shown in;

[0034] Fig.11 It is a structural diagram of the material pressing assembly of the present invention;

[0035] Fig.12 yes Fig.11 An exploded view of the structure shown in;

[0036] Fig.13 is a cross-sectional view of the waste slideway of the drawing and punching die of the present invention;

[0037] Fig.14 It is a structural diagram of the drawing and punching die of the present invention when it is in an initial state;

[0038] Fig.15 yes Fig.14 A partial enlarged view of the structure;

[0039] Fig.16 It is a structural diagram of the drawing and punching die of the present invention when performing local area drawing;

[0040] Fig.17 yes Fig.16 A partial enlarged view of the structure;

[0041] Fig.18 It is a structural diagram of the drawing and punching die of the present invention when it is in a closed state;

[0042] Fig.19 yes Fig.18 A partial enlarged view of the structure;

[0043] Reference numerals:

[0044] 1. First die base; 2. Second die base; 21. Third avoidance hole; 3. Punch assembly; 31. Punch body; 32. Punch mold surface; 33. Local mold surface; 34. First avoidance hole; 35. Waste slide; 36. Punching concave sleeve; 4. Concave die assembly; 41. Accommodating cavity; 411. First cavity; 412. Second cavity; 413. Third cavity; 4131. First connecting hole; 42. First guide plate; 43. Guide sleeve; 44. First hardening block; 5 , pressure ring; 51, second avoidance hole; 6, material pressing assembly; 61, first pressure block; 611, second hardening block; 62, second pressure block; 63, material pressing profile; 64, through hole; 65, guide column; 66, second guide plate; 67, nitrogen spring; 7, punching assembly; 71, punch base; 711, limit column hole; 712, second connecting hole; 72, connecting column; 73, punch; 731, punching knife; 74, nitrogen spring hardening block; 75, limit column. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0046] It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer", "close to", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See first Figures 1 to 12 ,like Figures 1 to 12 As shown, the drawing and punching die of the present invention includes a first die base 1, a second die base 2, a punch assembly 3, a die assembly 4, a pressure ring 5, a pressure assembly 6 and a punching assembly 7. The first die base 1 and the second die base 2 are arranged correspondingly, the pressure ring 5 is arranged in the second die base 2, the punch assembly 3 is arranged in the pressure ring 5, and the die assembly 4 is connected to the first die base 1; the die assembly 4 is provided with a accommodating cavity 41 that passes through the die assembly 4, and the pressure assembly 6 is movably arranged in the accommodating cavity 41, the pressure assembly 6 includes a pressure block and a pressure profile 63 arranged on the pressure block, and the punch assembly 3 is provided with a local profile 33 matching the pressure profile 63; the punching assembly 7 includes a connected punch base 71 and a punch 73, the pressure block is provided with a through hole 64 that passes through the pressure block, the punch 73 is movably arranged in the through hole 64, and the punch assembly 3 is provided with a punching sleeve 36 matching the punch 73.

[0049] Specifically, Figure 1The direction shown is the reference direction. The first die base 1 is located above the second die base 2. The blank holder 5 is sleeved in the second die base 2. The punch assembly 3 is sleeved in the blank holder 5. When the second die base 2, the blank holder 5 and the punch assembly 3 are connected in place, they together constitute the lower half of the drawing punching die. The die assembly 4 is provided with an accommodating cavity 41 penetrating therethrough in the vertical direction. The pressing assembly 6 is abutted and connected to the inner wall of the accommodating cavity 41. The punching assembly 7 penetrates the pressing assembly 6 and is movably connected to the pressing assembly 6. When the first die base 1, the die assembly 4, the pressure assembly 6 and the punching assembly 7 are connected in place, they together constitute the upper part of the drawing and punching die. When the upper and lower parts of the drawing and punching die are closed in place, the punch assembly 3 and the die assembly 4 together complete the pressing of the overall profile of the sheet metal part, the pressure profile 63 and the local profile 33 together complete the drawing of the local area of ​​the sheet metal part, and the punch 73 and the punching sleeve 36 together complete the punching of the local area of ​​the sheet metal part after drawing.

[0050] Preferably, the accommodating cavity 41 includes a first cavity 411, a second cavity 412 and a third cavity 413 which are connected to each other. The second cavity 412 and the third cavity 413 are respectively located on both sides of the first cavity 411. The cross-sectional area of ​​the first cavity 411 is larger than the cross-sectional area of ​​the second cavity 412. The cross-sectional area of ​​the third cavity 413 is larger than the cross-sectional area of ​​the first cavity 411. The pressing block includes a first pressing block 61 and a second pressing block 62. The pressing surface 63 is arranged on the second pressing block 62. The first pressing block 61 is arranged to be able to move in the first cavity 411. The second pressing block 62 is arranged to be able to move in the second cavity 412. The third cavity 413 is arranged to be able to accommodate the punch base 71.

[0051] Specifically, Figure 2 The direction shown is the reference direction, the first cavity 411 is in the shape of a square, the second cavity 412 is in the shape of a cylinder, and the second cavity 412 is located below the first cavity 411, the third cavity 413 is in the shape of a square, and the third cavity 413 is located above the first cavity 411, the area of ​​the horizontal cross section of the third cavity 413, the area of ​​the horizontal cross section of the first cavity 411, and the area of ​​the horizontal cross section of the second cavity 412 decrease in sequence, and the first pressing block 61 and the second pressing block 62 are connected and form a whole. The shape of the first pressing block 61 matches the shape of the first cavity 411 and can move up and down in the first cavity 411, and the shape of the second pressing block 62 matches the shape of the second cavity 412 and can move up and down in the second cavity 412. Based on the above structural setting, the cooperation between the first cavity 411 and the first pressing block 61 can prevent the pressing assembly 6 from falling off, and at the same time facilitate the pressing assembly 6 to determine its initial position; the third cavity 413 and the punch base 71 are fixedly connected, so that the punching assembly 7 is fixed on the die assembly 4.

[0052] It should be noted that the present invention does not impose any limitation on the specific shape and structure of the accommodating cavity 41. For example, the accommodating cavity 41 only includes a first cavity 411 and a second cavity 412 that are connected to each other, and the punch base 71 and the first die base 1 are connected and fixed. As long as the accommodating cavity 41 can accommodate the punching assembly 7 and can realize the movable setting of the pressing assembly 6 in the accommodating cavity 41, technical personnel in this field can set it according to actual conditions.

[0053] Further, in this preferred embodiment, a plurality of first guide members are disposed on the first cavity 411, and a plurality of matching second guide members are disposed on the first pressing block 61. Figure 2 ,by Figure 2 The direction shown is the reference direction. Four guide sleeve holes are provided on the bottom wall of the first cavity 411. The guide sleeve holes are provided with guide sleeves 43. Fig.11 and 12 ,by Fig.11 The direction shown is the reference direction. A second pressing block 62 is disposed in the middle position above the first pressing block 61. Four guide pillars 65 are also disposed above the first pressing block 61. The four guide pillars 65 are distributed circumferentially around the second pressing block 62. Figure 7 and 8 The guide post 65 can be inserted into the guide sleeve 43 , and the arrangement of the guide post 65 and the guide sleeve 43 can provide a guiding function for the movement of the pressing assembly 6 in the accommodating chamber 41 .

[0054] It should be noted that the present invention does not impose any restrictions on the specific structure and specific number of the first guide member and the second guide member. One of the first guide member and the second guide member can be a guide column 65, and the other of the first guide member and the second guide member can be a guide sleeve 43. Those skilled in the art can set them according to actual conditions.

[0055] In addition, in this preferred embodiment, a plurality of first sliding members are disposed on the inner wall of the first cavity 411, and a matching second sliding member is disposed on the first pressing block 61, and the first cavity 411 and the first pressing block 61 move relative to each other through the first sliding members and the second sliding members. Figure 2 The first sliding member is a first guide plate 42, and two first guide plates 42 are disposed on each of the four side walls of the first cavity 411. Fig.11 and 12, the second sliding member is a second guide plate 66, and two second guide plates 66 are arranged on each of the four side walls of the first pressing block 61. When the pressing assembly 6 and the accommodating cavity 41 are connected in place, the first guide plate 42 and the second guide plate 66 are abutted and connected, and relative movement can occur between the two. The setting of the first guide plate 42 and the second guide plate 66 can reduce the contact area between the side wall of the first pressing block 61 and the side wall of the first cavity 411, which is more conducive to the up and down movement of the pressing assembly 6 in the accommodating cavity 41, and the first guide plate 42 and the second guide plate 66 can play a guiding role in the up and down movement of the pressing assembly 6.

[0056] It should be noted that the present invention does not impose any restrictions on the specific structure and specific number of the first sliding member and the second sliding member. For example, one of the first sliding member and the second sliding member is a slide groove, and the other of the first sliding member and the second sliding member is a slider matching the slide groove. Those skilled in the art can set it according to actual conditions.

[0057] Furthermore, a plurality of first hardening blocks 44 are disposed in the first cavity 411, and a plurality of matching second hardening blocks 611 are disposed on the first pressing block 61. Figure 2 A plurality of first hard blocks 44 are disposed on the bottom wall of the first cavity 411, and a first hard block 44 is disposed on both sides of each guide sleeve 43. Fig.11 and 12 A plurality of second hardening blocks 611 are arranged above the first pressing block 61, and a second hardening block 611 is arranged on both sides of each guide column 65. When the pressing assembly 6 and the accommodating cavity 41 are connected in place, the first hardening block 44 and the second hardening block 611 are abutted and connected. Based on the above structural setting, when the pressing assembly 6 moves up and down in the accommodating cavity 41, it can prevent damage to the contact surface between the first pressing block 61 and the first cavity 411. At the same time, the setting of the first hardening block 44 and the second hardening block 611 can accurately determine the initial position of the pressing assembly 6.

[0058] Preferably, a nitrogen spring 67 is provided on one side of the press block close to the first die base 1, and a matching nitrogen spring hardening block 74 is provided on the punch base 71. When the first die base 1 and the second die base 2 are closed in place, the nitrogen spring 67 is compressed and the nitrogen spring 67 and the nitrogen spring hardening block 74 are in contact and connected. Fig.11 and 12 Four nitrogen springs 67 are provided below the first pressing block 61, see Fig. 9 and 10A nitrogen spring hardening block 74 is provided above the punch base 71. When the pressing assembly 6 moves upward in the accommodating cavity 41, it can move to a position where the nitrogen spring 67 and the nitrogen spring hardening block 78 abut against each other, and at this time, the nitrogen spring 67 is compressed.

[0059] Further, in this preferred embodiment, a limiting member is provided on one side of the punch base 71 close to the press block, and the limiting member is configured to abut against the press block when the first die holder 1 and the second die holder 2 are closed in place. Figures 9 to 12 A connecting column 72 is provided in the middle position above the punch base 71, a punch 73 is connected above the connecting column 72, a punch knife 731 is provided above the punch 73, a through hole 64 passes through the first pressing block 61 and the second pressing block 62, and the shape of the through hole 64 matches the shape of the connecting column 72, the punch 73 and the punch knife 731 after being connected, and the structure after the connecting column 72, the punch 73 and the punch knife 731 are connected can move relative to the through hole 64, and four limiting column holes 711 are also provided above the punch base 71, and the limiting member is a limiting column 75, and the limiting column 75 is arranged in the limiting column hole 711. When the pressing assembly 6 moves upward in the accommodating cavity 41, the punch knife 731 is exposed from the through hole 64, and the setting of the limiting column 75 can limit the distance of the punch knife 731 being exposed, thereby improving the accuracy of sheet punching.

[0060] Preferably, the drawing punching die further comprises a waste recovery component, which is configured to recover the sheet material waste generated at the punching recess 36. Figures 3 to 6 The punch assembly 3 includes a punch body 31, a convex model surface 32 is arranged on the punch body 31, and a concave model surface (not shown in the figure) matching the convex model surface 32 is arranged on the concave model assembly 4. The convex model surface 32 and the concave model surface jointly complete the compaction and forming of the sheet material. The convex model surface 32 is provided with a local profile 33 which is concave in a local area. A punching sleeve 36 is arranged in the local profile 33. The punching knife 731 is inserted into the punching sleeve 36 to complete the punching. The waste recovery component is arranged below the punching sleeve 36, and the waste recovery component recovers the waste generated by punching.

[0061] See next Fig.13 Specifically, as a preferred arrangement, the waste recovery component is a waste chute 35, a first avoidance hole 34 is provided on the punch assembly 3, a second avoidance hole 51 is provided on the side wall of the blank holder 5, and a third avoidance hole 21 is provided on the second die base 2. The waste chute 35 passes through the first avoidance hole 34, the second avoidance hole 51 and the third avoidance hole 21 in sequence from the inside of the punch assembly 3 and extends to the outside of the second die base 2. The waste chute 35 is arranged obliquely, and the waste falls into the waste chute 35 and slides to the outside of the second die base 2, which will not cause congestion of the waste.

[0062] It should be noted that the present invention does not impose any limitation on the specific structure of the waste recovery component. For example, in a feasible embodiment, the waste recovery component is a recovery box, which is detachably arranged in the male mold body 31, and those skilled in the art can set it according to actual circumstances.

[0063] See next Figure 7 and 8 , the die assembly 4 is provided with a plurality of first connection holes 4131, the punch base 71 is provided with a plurality of matching second connection holes 712, and the fasteners pass through the first connection holes 4131 and the second connection holes 712 and are fixed to connect the punch assembly 7 and the die assembly 4. Specifically, four first connection holes 4131 are provided on the bottom wall of the third cavity 413, and four matching second connection holes 712 are provided on the punch base 71, and the fasteners fix the first connection holes 4131 and the second connection holes 712 to achieve the fixation of the punch assembly 7 and the die assembly 4.

[0064] The working process of the drawing and punching die is as follows:

[0065] See also Fig.14 and 15 The drawing and punching die is in a non-working state, the nitrogen spring 67 is not compressed, the first hardening block 44 and the second hardening block 611 are abutted and connected, the guide column 65 is located in the guide sleeve 43, the pressing surface 63 on the second pressing block 62 is lower than the concave mold surface of the concave die assembly 4, and the first die base 1 and the second die base 2 are in an unclosed state.

[0066] See next Fig.16 and 17 , the first die base 1 moves downward, the pressing surface 63 contacts the sheet material first, the nitrogen spring 67 is compressed, and the nitrogen spring 67 provides a reaction force, so that the pressing surface 63 and the local surface 33 jointly complete the drawing of the local area of ​​the sheet material, and the convex model surface 32 and the concave model surface on the concave die assembly 4 jointly press the sheet material as a whole so that the sheet material is pressed and formed as a whole.

[0067] See next Fig.18 and 19, the first die base 1 continues to move downward, the first hardening block 44 and the second hardening block 611 are separated, and the pressing assembly 6 moves upward in the accommodating cavity 41, so that the punch 731 is exposed outside the pressing profile 63 until the limiting column 75 and the first pressing block 61 are abutted. At this time, the nitrogen spring 67 is compressed to the shortest, the pressing profile 63 and the local profile 33 jointly press the sheet material therebetween, and the punch 731 cuts into the punching sleeve 36 to complete the punching of the local area of ​​the sheet material after drawing. After the punching is completed, the waste material falls from the bottom of the punching sleeve 36 into the waste slide 35, and is discharged from the waste slide 35 to the outside of the drawing and punching die.

[0068] The concave die component 4 and the convex die component 3 of the drawing and punching die of the present invention are pressed and formed for processing and forming the vehicle front cover outer panel. The pressing surface 63 and the local surface 33 are used for processing the logo installation positioning hole of the vehicle front cover outer panel. Through the arrangement of the pressing component 6 and the punching component 7, the local area of ​​the front cover outer panel can be accurately drawn and punched to prevent the logo installation deviation caused by processing deviation.

[0069] It should be noted that the present invention does not impose any restrictions on the application scenarios of the drawing and punching dies. The dies can also be applied to drawing and punching of local areas of other components, and those skilled in the art can set them according to actual conditions.

[0070] The depth of the punch blade 731 of the drawing and punching die entering the punching recess 36 is 5 mm, and the stroke of the pressing component 6 is set to 10 mm. Specifically, 10 mm before the first die base 1 and the second die base 2 are closed, the drawing of the local area of ​​the sheet is completed, and 4 mm before the first die base 1 and the second die base 2 are closed (minus the thickness of the sheet), the punching of the local area is completed. An independent tool body is set through the AutoForm software to simulate the forming force required for drawing the local area. Taking the front cover outer panel as an example, the simulated forming force is 1.8 T. Using four X750 nitrogen springs, it can provide an initial clamping force of 3 T. The simulation confirms that it can meet the forming requirements.

[0071] Since the first die base 1 and the second die base 2 are not closed in place when punching occurs, the 4mm sheet material is drawn into place after the punching is completed. During the 4mm drawing process, the punching shape inevitably expands outward. It has been measured that the circumferential expansion amount is between 0.02mm and 0.08mm. Therefore, when selecting the cutting edge size of the punch 731, a -0.1mm treatment is made on the basis of the target aperture. For example, if the target aperture is 10mm, a -0.1mm treatment is made on the basis thereof, and the punching aperture is 9.9mm. It should be noted that the present invention does not impose any limitation on the specific aperture value of the target aperture, and those skilled in the art can set it according to actual conditions.

[0072] The stamping direction of the drawing process needs to be fine-tuned according to the punching angle requirements. Under the initial stamping direction, the punching angle is 16.8°. To ensure the punching accuracy, the stamping direction can be rotated 7° around the Y-axis direction of the vehicle body without changing the mold surface and the shape of the sheet. The punching angle becomes 9.8° without changing the original drawing depth and material utilization rate. It has been verified that the formability of the part remains unchanged.

[0073] The front cover outer panel can be allowed to rotate within 20° based on the conventional stamping direction without worrying about lateral force problems. At the same time, the pressing surface of the front cover outer panel is flatter. After simulation verification, there is no need to worry about the problem of unstable sheet positioning.

[0074] In summary, the drawing and punching die of the present invention can draw a local area of ​​the sheet material by setting the pressing profile 63 and the local profile 33. The punch 73 is movably set in the through hole 64, so that punching can be performed after the sheet material is drawn, while ensuring the accuracy of the punching.

[0075] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A drawing and punching die, characterized in that: The drawing and punching die comprises a first die base, a second die base, a concave die assembly, a convex die assembly, a blank holder, a material holding assembly and a punching assembly. The first die base and the second die base are arranged correspondingly, the blank holder is arranged in the second die base, the male die assembly is arranged in the blank holder, and the female die assembly is connected to the first die base; The concave mold component is provided with a receiving cavity penetrating the concave mold component, the pressing component is movably arranged in the receiving cavity, the pressing component comprises a pressing block and a pressing profile arranged on the pressing block, and the convex mold component is provided with a local profile matching the pressing profile; The male mold component is provided with a male mold surface, and the female mold component is provided with a female mold surface matching the male mold surface. The male mold surface and the female mold surface jointly complete the compaction and forming of the sheet material, and the pressing mold surface and the local mold surface jointly complete the drawing of the local area of ​​the sheet material. The punching assembly includes a connected punch base and a punch, the pressing block is provided with a through hole penetrating the pressing block, the punch is movably arranged in the through hole, and the punch assembly is provided with a punching sleeve matching the punch.

2. The drawing punching die according to claim 1, characterized in that: The accommodating cavity includes a first cavity, a second cavity and a third cavity which are connected to each other, the second cavity and the third cavity are respectively located on both sides of the first cavity, the cross-sectional area of ​​the first cavity is larger than the cross-sectional area of ​​the second cavity, the cross-sectional area of ​​the third cavity is larger than the cross-sectional area of ​​the first cavity, the pressing block includes a first pressing block and a second pressing block, the pressing profile is arranged on the second pressing block, the first pressing block is arranged to be able to move in the first cavity, the second pressing block is arranged to be able to move in the second cavity, and the third cavity is arranged to be able to accommodate the punch base.

3. The drawing and punching die according to claim 2, characterized in that: The first cavity is provided with a plurality of first guide members, and the first pressing block is provided with a plurality of matching second guide members.

4. The drawing punching die according to claim 3, characterized in that: A plurality of first sliding components are arranged on the inner wall of the first cavity, a matching second sliding component is arranged on the first pressing block, and the first cavity and the first pressing block move relative to each other through the first sliding components and the second sliding components.

5. The drawing and punching die according to claim 4, characterized in that: A plurality of first hardening blocks are arranged in the first cavity, and a plurality of matching second hardening blocks are arranged on the first pressing block.

6. The drawing and punching die according to any one of claims 1 to 5, characterized in that: A nitrogen spring is arranged on one side of the pressing block close to the first die base, and a matching nitrogen spring hardening block is arranged on the punch base. When the first die base and the second die base are closed in place, the nitrogen spring is compressed and the nitrogen spring and the nitrogen spring hardening block are abutted and connected.

7. The drawing and punching die according to claim 6, characterized in that: A limiting component is disposed on one side of the punch base close to the press block, and the limiting component is configured to abut against the press block when the first die base and the second die base are closed in place.

8. The drawing and punching die according to any one of claims 1 to 5, characterized in that: The drawing and punching die further comprises a waste material recovery component, which is configured to recover the sheet material waste generated at the punching sleeve.

9. The drawing punching die according to claim 8, characterized in that: The waste recovery component is a waste slide plate, a first avoidance hole is arranged on the punch assembly, a second avoidance hole is arranged on the side wall of the pressure ring, and a third avoidance hole is arranged on the second mold base. The waste slide plate passes through the first avoidance hole, the second avoidance hole and the third avoidance hole in sequence from the inside of the punch assembly and extends to the outside of the second mold base.

10. The drawing and punching die according to any one of claims 1 to 5, characterized in that: The die assembly is provided with a plurality of first connection holes, and the punch base is provided with a plurality of matching second connection holes. Fasteners pass through the first connection holes and the second connection holes and are fixed to connect the punch assembly and the die assembly.

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